Retractable side wall core barrel



DCC 4, 1951 J. H. PAGE RETRACTBLE SIDE WALL CORE BARREL 2 SHEETS- SHEET 1 Filed June l, 1948 Fig..

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De@ 4, 1951 J. H. PAGE RETRACTABLE SIDE WALL CORE BARREL '2 sI-I'EETs-SHEET 2 Filed June l, 1948 l Fig. 3

Joseph H. Page y INVENTOR.

9 BY @am rthis were both tedious and costly.

Patented Dec. 4, 1951 l RETRACTABLE SIDE WALL CQREVBARREL Joseph H.,Page,` Houma, La., assigner Yof fortyfive per centto John M. Walker and ten per cent to Sam M. Hattaway, both of Houma, La.

Application Junei, 194s, serial No. ,ao-,255

. removed without the necessity for removing the drill pipe as well.

And yet another object of the invention is to provide a device that will efciently take the desired sample and retain it until removed for analysis.

The invention is fully described as will hereinafter appear in connection with the accompanying drawings, and the scope of the application which will be indicated in the following claim.

Figure 1 is a vertical elevation of the device of the invention in use;

Figure 2 is an enlarged fragmentary'sectional view of the sample taking means in a well;

Figure 3 is an enlarged elevational View, partly in section, of the sample taking device with the core members retracted;

Figure 4 is a horizontal view taken substantially on line 4--4 of Figure 3;

Figure 5 is a horizontal view taken substantially on line 5-5 of Figure 3; and,

Figure 6 is an exploded View of the core element witha sample that has been taken.

Referring to the gures, there is shown a bore or well I0 from which a sample is to be removed. This is generally done in order to determine geological formations with respect to the presence or absence of oil, gas, water or minerals, or to determine the character of the particular area. Methods used to obtain such information before This has now been overcome.

A tubular string ofV drill pipe I2 of usual construction is inserted into bore Ill, the device o the invention having been applied in a manner now to be described.

The invention is shown generally at I4 and includes a guide member I6, a sleeve I8 and a mandrel 20. As is clearly seen in Figures 2 through 4, guide member I6 is annular in construction and l includes a plurality of lateral flanges 22, welded or otherwise secured to guide I6 at 24. Guide I6 is internally threaded at its lower extremity nally for' suchpurposes at the lower length thereof. Sleeve I8 is threadedly counterbored at 28 in an inward taper along theinner surface for a greaterr portion of its length. A smooth counter-bore 30 joins threaded section 28 with a smaller smooth Ybore 312 at the outer end ofr sleeve I8, thus forming a shoulder 3ft,v for a purpose soon rto appear. Sleeve i8 is tapered as disclosed above in order to fit the threaded endv 36 of any size pipe I2 that may be used. 4,

Shoulder 3ft seats mandrel 2t by means of a corresponding solid annular ring 38 slidably retained in sleeve I8. Mandrel 2li includes an upper spear-headed member til adapted to be grasped by the tongs l2 of an overshot 44 secured to a suitable cable 46. As the overshot forms no part ofthe invention, and is readily available for purchase, no further description is believed necessary. Mandrel 2E! includes a lower bifurcated or forked core holding means i8 of considerable length to extend below guide I6. Mandrel 2|] is slotted at its lower end to receive a pair of leaf springs 50, held in place by means of bolts 52 extending through a transverse bore in the reduced lower end 54 thereof of mandrel 20.

Leaf'springs 54, of which there are two, urge core holders 56 outwardly. Core holders 56 consist of two parts, a solid rod 58 apertured at l), and pivotally retained on forks d3 by means of pivot pins 62. The opposite ends of holders 56 includean externally threaded skirt 64 engaging an internally threaded hollow core tube 66,

beveled at'the outer extremity at Vll to insure penetration of the walls of a well.

In operation, sleeve I8 is secured in `guide means It and the device is secured to the lower end of a drill or pipe l2. Mandrel 2t, with core holders 5t in the position shown in Figure 3 or in dotted lines in Figure 2, is then lowered into pipe l2 until seated on shoulder Eil of sleeve i8. Mandrel 2@ integrally includes or has assembled therewith, as a part thereof, the forks d8, which extend below the guide device lll when the mandrel is seated therein. Springs 53, between the forks 48, urge the core holders 5@ outwardly, with Y makes this operation simple and the device is removed from the well, the core 'l0 remaining therein by virtue of the high frictional contact with the side wall of the core tube 66. Tube 66 is then removed from rod B4 and a sample core 10 is available for analysis. Thus, there is no necessity for removing the drill pipe as has been usual heretofore and the only parts subject to wear are tubes 66 which are easily replaced.

From the above, it is seen that the several objects of the invention are attained and other `advantageous results achieved.

As many modifications of the embodiment above illustrated might be made without departing from the spirit and scope of the present invention, since it is intended that the above description and accompanying claim be illustrated and not in a limiting sense.

Having described the invention, what claimed as new is:

Al wire line sidewall sampling tool for wells comprising a string of pipe in the well bore, a shoulder inside such pipe adjacent the lower end thereof, a side wall coring member including a mandrel to move down through said pipe, acooperating shoulder on said mandrel to engage and stop on said pipe shoulder to limit Vdownward movement of said mandrel, a lower end on said mandrel projecting below the lower end of said pipe when said shoulders are engaged, a transverse slot in saidprojecting end of said mandrel, a plurality of core holders disposed in said slot,

a pivotedvconnection between said core holders and said mandred adjacent the lower end of said slot, said slot of a length to receive said core holders in upstanding inverted position, each core holder having an open core receiving end disposed upwardly in said slot as said core holder stands inverted when said mandrel is landed on said shoulder, spring means normally urging said core holders to pivot oppositely out of said slot after such core holders pass out of the lower end of said pipe to engage the well bore wall, each said core holder being adapted to cut a core upon upward movement of said mandrel whereby said core holders pivot from inverted to vertical position as said mandrel is raised and withdrawn back into said pipe for removal from the well while the string of pipe remains in the well bore.

JOSEPH H. PAGE.

REFERENCES CITED The following references are of record in the le of this patent? UNITED STATES PATENTS 

